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Commit | Line | Data |
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34dc7c2f BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
428870ff | 22 | * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
ea04106b | 23 | * Copyright (c) 2011, 2014 by Delphix. All rights reserved. |
a08ee875 | 24 | * Copyright (c) 2013 Steven Hartland. All rights reserved. |
e10b0808 | 25 | * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. |
34dc7c2f BB |
26 | */ |
27 | ||
34dc7c2f BB |
28 | #include <sys/dsl_pool.h> |
29 | #include <sys/dsl_dataset.h> | |
428870ff | 30 | #include <sys/dsl_prop.h> |
34dc7c2f BB |
31 | #include <sys/dsl_dir.h> |
32 | #include <sys/dsl_synctask.h> | |
428870ff BB |
33 | #include <sys/dsl_scan.h> |
34 | #include <sys/dnode.h> | |
34dc7c2f BB |
35 | #include <sys/dmu_tx.h> |
36 | #include <sys/dmu_objset.h> | |
37 | #include <sys/arc.h> | |
38 | #include <sys/zap.h> | |
39 | #include <sys/zio.h> | |
40 | #include <sys/zfs_context.h> | |
41 | #include <sys/fs/zfs.h> | |
b128c09f BB |
42 | #include <sys/zfs_znode.h> |
43 | #include <sys/spa_impl.h> | |
428870ff | 44 | #include <sys/dsl_deadlist.h> |
9ae529ec CS |
45 | #include <sys/bptree.h> |
46 | #include <sys/zfeature.h> | |
29809a6c | 47 | #include <sys/zil_impl.h> |
a08ee875 | 48 | #include <sys/dsl_userhold.h> |
ea04106b | 49 | #include <sys/trace_txg.h> |
34dc7c2f | 50 | |
a08ee875 LG |
51 | /* |
52 | * ZFS Write Throttle | |
53 | * ------------------ | |
54 | * | |
55 | * ZFS must limit the rate of incoming writes to the rate at which it is able | |
56 | * to sync data modifications to the backend storage. Throttling by too much | |
57 | * creates an artificial limit; throttling by too little can only be sustained | |
58 | * for short periods and would lead to highly lumpy performance. On a per-pool | |
59 | * basis, ZFS tracks the amount of modified (dirty) data. As operations change | |
60 | * data, the amount of dirty data increases; as ZFS syncs out data, the amount | |
61 | * of dirty data decreases. When the amount of dirty data exceeds a | |
62 | * predetermined threshold further modifications are blocked until the amount | |
63 | * of dirty data decreases (as data is synced out). | |
64 | * | |
65 | * The limit on dirty data is tunable, and should be adjusted according to | |
66 | * both the IO capacity and available memory of the system. The larger the | |
67 | * window, the more ZFS is able to aggregate and amortize metadata (and data) | |
68 | * changes. However, memory is a limited resource, and allowing for more dirty | |
69 | * data comes at the cost of keeping other useful data in memory (for example | |
70 | * ZFS data cached by the ARC). | |
71 | * | |
72 | * Implementation | |
73 | * | |
74 | * As buffers are modified dsl_pool_willuse_space() increments both the per- | |
75 | * txg (dp_dirty_pertxg[]) and poolwide (dp_dirty_total) accounting of | |
76 | * dirty space used; dsl_pool_dirty_space() decrements those values as data | |
77 | * is synced out from dsl_pool_sync(). While only the poolwide value is | |
78 | * relevant, the per-txg value is useful for debugging. The tunable | |
79 | * zfs_dirty_data_max determines the dirty space limit. Once that value is | |
80 | * exceeded, new writes are halted until space frees up. | |
81 | * | |
82 | * The zfs_dirty_data_sync tunable dictates the threshold at which we | |
83 | * ensure that there is a txg syncing (see the comment in txg.c for a full | |
84 | * description of transaction group stages). | |
85 | * | |
86 | * The IO scheduler uses both the dirty space limit and current amount of | |
87 | * dirty data as inputs. Those values affect the number of concurrent IOs ZFS | |
88 | * issues. See the comment in vdev_queue.c for details of the IO scheduler. | |
89 | * | |
90 | * The delay is also calculated based on the amount of dirty data. See the | |
91 | * comment above dmu_tx_delay() for details. | |
92 | */ | |
e95853a3 | 93 | |
a08ee875 LG |
94 | /* |
95 | * zfs_dirty_data_max will be set to zfs_dirty_data_max_percent% of all memory, | |
96 | * capped at zfs_dirty_data_max_max. It can also be overridden with a module | |
97 | * parameter. | |
98 | */ | |
99 | unsigned long zfs_dirty_data_max = 0; | |
100 | unsigned long zfs_dirty_data_max_max = 0; | |
101 | int zfs_dirty_data_max_percent = 10; | |
102 | int zfs_dirty_data_max_max_percent = 25; | |
e95853a3 BB |
103 | |
104 | /* | |
a08ee875 | 105 | * If there is at least this much dirty data, push out a txg. |
e95853a3 | 106 | */ |
a08ee875 | 107 | unsigned long zfs_dirty_data_sync = 64 * 1024 * 1024; |
e95853a3 | 108 | |
a08ee875 LG |
109 | /* |
110 | * Once there is this amount of dirty data, the dmu_tx_delay() will kick in | |
111 | * and delay each transaction. | |
112 | * This value should be >= zfs_vdev_async_write_active_max_dirty_percent. | |
113 | */ | |
114 | int zfs_delay_min_dirty_percent = 60; | |
e95853a3 | 115 | |
a08ee875 LG |
116 | /* |
117 | * This controls how quickly the delay approaches infinity. | |
118 | * Larger values cause it to delay more for a given amount of dirty data. | |
119 | * Therefore larger values will cause there to be less dirty data for a | |
120 | * given throughput. | |
121 | * | |
122 | * For the smoothest delay, this value should be about 1 billion divided | |
123 | * by the maximum number of operations per second. This will smoothly | |
124 | * handle between 10x and 1/10th this number. | |
125 | * | |
126 | * Note: zfs_delay_scale * zfs_dirty_data_max must be < 2^64, due to the | |
127 | * multiply in dmu_tx_delay(). | |
128 | */ | |
129 | unsigned long zfs_delay_scale = 1000 * 1000 * 1000 / 2000; | |
e95853a3 | 130 | |
a08ee875 LG |
131 | hrtime_t zfs_throttle_delay = MSEC2NSEC(10); |
132 | hrtime_t zfs_throttle_resolution = MSEC2NSEC(10); | |
e95853a3 | 133 | |
428870ff | 134 | int |
b128c09f | 135 | dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp) |
34dc7c2f BB |
136 | { |
137 | uint64_t obj; | |
138 | int err; | |
139 | ||
140 | err = zap_lookup(dp->dp_meta_objset, | |
e10b0808 | 141 | dsl_dir_phys(dp->dp_root_dir)->dd_child_dir_zapobj, |
b128c09f | 142 | name, sizeof (obj), 1, &obj); |
34dc7c2f BB |
143 | if (err) |
144 | return (err); | |
145 | ||
a08ee875 | 146 | return (dsl_dir_hold_obj(dp, obj, name, dp, ddp)); |
34dc7c2f BB |
147 | } |
148 | ||
149 | static dsl_pool_t * | |
150 | dsl_pool_open_impl(spa_t *spa, uint64_t txg) | |
151 | { | |
152 | dsl_pool_t *dp; | |
153 | blkptr_t *bp = spa_get_rootblkptr(spa); | |
34dc7c2f BB |
154 | |
155 | dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP); | |
156 | dp->dp_spa = spa; | |
157 | dp->dp_meta_rootbp = *bp; | |
a08ee875 | 158 | rrw_init(&dp->dp_config_rwlock, B_TRUE); |
34dc7c2f BB |
159 | txg_init(dp, txg); |
160 | ||
161 | txg_list_create(&dp->dp_dirty_datasets, | |
162 | offsetof(dsl_dataset_t, ds_dirty_link)); | |
29809a6c MA |
163 | txg_list_create(&dp->dp_dirty_zilogs, |
164 | offsetof(zilog_t, zl_dirty_link)); | |
34dc7c2f BB |
165 | txg_list_create(&dp->dp_dirty_dirs, |
166 | offsetof(dsl_dir_t, dd_dirty_link)); | |
167 | txg_list_create(&dp->dp_sync_tasks, | |
a08ee875 | 168 | offsetof(dsl_sync_task_t, dst_node)); |
34dc7c2f BB |
169 | |
170 | mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL); | |
a08ee875 | 171 | cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL); |
34dc7c2f | 172 | |
e10b0808 AX |
173 | dp->dp_iput_taskq = taskq_create("z_iput", max_ncpus, defclsyspri, |
174 | max_ncpus * 8, INT_MAX, TASKQ_PREPOPULATE | TASKQ_DYNAMIC); | |
9babb374 | 175 | |
34dc7c2f BB |
176 | return (dp); |
177 | } | |
178 | ||
179 | int | |
9ae529ec | 180 | dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp) |
34dc7c2f BB |
181 | { |
182 | int err; | |
183 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
9ae529ec | 184 | |
87dac73d AX |
185 | /* |
186 | * Initialize the caller's dsl_pool_t structure before we actually open | |
187 | * the meta objset. This is done because a self-healing write zio may | |
188 | * be issued as part of dmu_objset_open_impl() and the spa needs its | |
189 | * dsl_pool_t initialized in order to handle the write. | |
190 | */ | |
191 | *dpp = dp; | |
192 | ||
9ae529ec CS |
193 | err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp, |
194 | &dp->dp_meta_objset); | |
87dac73d | 195 | if (err != 0) { |
9ae529ec | 196 | dsl_pool_close(dp); |
87dac73d AX |
197 | *dpp = NULL; |
198 | } | |
9ae529ec CS |
199 | |
200 | return (err); | |
201 | } | |
202 | ||
203 | int | |
204 | dsl_pool_open(dsl_pool_t *dp) | |
205 | { | |
206 | int err; | |
b128c09f BB |
207 | dsl_dir_t *dd; |
208 | dsl_dataset_t *ds; | |
428870ff | 209 | uint64_t obj; |
34dc7c2f | 210 | |
a08ee875 | 211 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
34dc7c2f BB |
212 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
213 | DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1, | |
214 | &dp->dp_root_dir_obj); | |
215 | if (err) | |
216 | goto out; | |
217 | ||
a08ee875 | 218 | err = dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
219 | NULL, dp, &dp->dp_root_dir); |
220 | if (err) | |
221 | goto out; | |
222 | ||
b128c09f | 223 | err = dsl_pool_open_special_dir(dp, MOS_DIR_NAME, &dp->dp_mos_dir); |
34dc7c2f BB |
224 | if (err) |
225 | goto out; | |
226 | ||
9ae529ec | 227 | if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) { |
b128c09f BB |
228 | err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd); |
229 | if (err) | |
230 | goto out; | |
e10b0808 AX |
231 | err = dsl_dataset_hold_obj(dp, |
232 | dsl_dir_phys(dd)->dd_head_dataset_obj, FTAG, &ds); | |
9babb374 BB |
233 | if (err == 0) { |
234 | err = dsl_dataset_hold_obj(dp, | |
e10b0808 | 235 | dsl_dataset_phys(ds)->ds_prev_snap_obj, dp, |
9babb374 BB |
236 | &dp->dp_origin_snap); |
237 | dsl_dataset_rele(ds, FTAG); | |
238 | } | |
a08ee875 | 239 | dsl_dir_rele(dd, dp); |
b128c09f BB |
240 | if (err) |
241 | goto out; | |
b128c09f BB |
242 | } |
243 | ||
9ae529ec | 244 | if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) { |
428870ff BB |
245 | err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME, |
246 | &dp->dp_free_dir); | |
b128c09f BB |
247 | if (err) |
248 | goto out; | |
428870ff | 249 | |
b128c09f | 250 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 251 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj); |
b128c09f BB |
252 | if (err) |
253 | goto out; | |
a08ee875 | 254 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff | 255 | dp->dp_meta_objset, obj)); |
b128c09f BB |
256 | } |
257 | ||
ea04106b AX |
258 | /* |
259 | * Note: errors ignored, because the leak dir will not exist if we | |
260 | * have not encountered a leak yet. | |
261 | */ | |
262 | (void) dsl_pool_open_special_dir(dp, LEAK_DIR_NAME, | |
263 | &dp->dp_leak_dir); | |
264 | ||
265 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_ASYNC_DESTROY)) { | |
9ae529ec CS |
266 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
267 | DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1, | |
268 | &dp->dp_bptree_obj); | |
269 | if (err != 0) | |
270 | goto out; | |
271 | } | |
272 | ||
ea04106b | 273 | if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMPTY_BPOBJ)) { |
753c3839 MA |
274 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
275 | DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1, | |
276 | &dp->dp_empty_bpobj); | |
277 | if (err != 0) | |
278 | goto out; | |
279 | } | |
280 | ||
428870ff BB |
281 | err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
282 | DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1, | |
283 | &dp->dp_tmp_userrefs_obj); | |
284 | if (err == ENOENT) | |
285 | err = 0; | |
286 | if (err) | |
287 | goto out; | |
288 | ||
9ae529ec | 289 | err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg); |
428870ff | 290 | |
34dc7c2f | 291 | out: |
a08ee875 | 292 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
34dc7c2f BB |
293 | return (err); |
294 | } | |
295 | ||
296 | void | |
297 | dsl_pool_close(dsl_pool_t *dp) | |
298 | { | |
b128c09f | 299 | /* |
a08ee875 LG |
300 | * Drop our references from dsl_pool_open(). |
301 | * | |
b128c09f BB |
302 | * Since we held the origin_snap from "syncing" context (which |
303 | * includes pool-opening context), it actually only got a "ref" | |
304 | * and not a hold, so just drop that here. | |
305 | */ | |
306 | if (dp->dp_origin_snap) | |
a08ee875 | 307 | dsl_dataset_rele(dp->dp_origin_snap, dp); |
34dc7c2f | 308 | if (dp->dp_mos_dir) |
a08ee875 | 309 | dsl_dir_rele(dp->dp_mos_dir, dp); |
428870ff | 310 | if (dp->dp_free_dir) |
a08ee875 | 311 | dsl_dir_rele(dp->dp_free_dir, dp); |
ea04106b AX |
312 | if (dp->dp_leak_dir) |
313 | dsl_dir_rele(dp->dp_leak_dir, dp); | |
34dc7c2f | 314 | if (dp->dp_root_dir) |
a08ee875 | 315 | dsl_dir_rele(dp->dp_root_dir, dp); |
34dc7c2f | 316 | |
428870ff BB |
317 | bpobj_close(&dp->dp_free_bpobj); |
318 | ||
34dc7c2f BB |
319 | /* undo the dmu_objset_open_impl(mos) from dsl_pool_open() */ |
320 | if (dp->dp_meta_objset) | |
428870ff | 321 | dmu_objset_evict(dp->dp_meta_objset); |
34dc7c2f BB |
322 | |
323 | txg_list_destroy(&dp->dp_dirty_datasets); | |
29809a6c | 324 | txg_list_destroy(&dp->dp_dirty_zilogs); |
428870ff | 325 | txg_list_destroy(&dp->dp_sync_tasks); |
34dc7c2f | 326 | txg_list_destroy(&dp->dp_dirty_dirs); |
34dc7c2f | 327 | |
e10b0808 AX |
328 | /* |
329 | * We can't set retry to TRUE since we're explicitly specifying | |
330 | * a spa to flush. This is good enough; any missed buffers for | |
331 | * this spa won't cause trouble, and they'll eventually fall | |
332 | * out of the ARC just like any other unused buffer. | |
333 | */ | |
334 | arc_flush(dp->dp_spa, FALSE); | |
335 | ||
34dc7c2f | 336 | txg_fini(dp); |
428870ff | 337 | dsl_scan_fini(dp); |
e10b0808 AX |
338 | dmu_buf_user_evict_wait(); |
339 | ||
a08ee875 | 340 | rrw_destroy(&dp->dp_config_rwlock); |
34dc7c2f | 341 | mutex_destroy(&dp->dp_lock); |
3558fd73 | 342 | taskq_destroy(dp->dp_iput_taskq); |
b128c09f | 343 | if (dp->dp_blkstats) |
ea04106b | 344 | vmem_free(dp->dp_blkstats, sizeof (zfs_all_blkstats_t)); |
34dc7c2f BB |
345 | kmem_free(dp, sizeof (dsl_pool_t)); |
346 | } | |
347 | ||
348 | dsl_pool_t * | |
b128c09f | 349 | dsl_pool_create(spa_t *spa, nvlist_t *zplprops, uint64_t txg) |
34dc7c2f BB |
350 | { |
351 | int err; | |
352 | dsl_pool_t *dp = dsl_pool_open_impl(spa, txg); | |
353 | dmu_tx_t *tx = dmu_tx_create_assigned(dp, txg); | |
428870ff | 354 | objset_t *os; |
b128c09f | 355 | dsl_dataset_t *ds; |
428870ff | 356 | uint64_t obj; |
b128c09f | 357 | |
a08ee875 LG |
358 | rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); |
359 | ||
b128c09f | 360 | /* create and open the MOS (meta-objset) */ |
428870ff BB |
361 | dp->dp_meta_objset = dmu_objset_create_impl(spa, |
362 | NULL, &dp->dp_meta_rootbp, DMU_OST_META, tx); | |
34dc7c2f BB |
363 | |
364 | /* create the pool directory */ | |
365 | err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, | |
366 | DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx); | |
c06d4368 | 367 | ASSERT0(err); |
34dc7c2f | 368 | |
428870ff | 369 | /* Initialize scan structures */ |
a08ee875 | 370 | VERIFY0(dsl_scan_init(dp, txg)); |
428870ff | 371 | |
34dc7c2f | 372 | /* create and open the root dir */ |
b128c09f | 373 | dp->dp_root_dir_obj = dsl_dir_create_sync(dp, NULL, NULL, tx); |
a08ee875 | 374 | VERIFY0(dsl_dir_hold_obj(dp, dp->dp_root_dir_obj, |
34dc7c2f BB |
375 | NULL, dp, &dp->dp_root_dir)); |
376 | ||
377 | /* create and open the meta-objset dir */ | |
b128c09f | 378 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, MOS_DIR_NAME, tx); |
a08ee875 | 379 | VERIFY0(dsl_pool_open_special_dir(dp, |
b128c09f BB |
380 | MOS_DIR_NAME, &dp->dp_mos_dir)); |
381 | ||
428870ff BB |
382 | if (spa_version(spa) >= SPA_VERSION_DEADLISTS) { |
383 | /* create and open the free dir */ | |
384 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, | |
385 | FREE_DIR_NAME, tx); | |
a08ee875 | 386 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
387 | FREE_DIR_NAME, &dp->dp_free_dir)); |
388 | ||
389 | /* create and open the free_bplist */ | |
e10b0808 | 390 | obj = bpobj_alloc(dp->dp_meta_objset, SPA_OLD_MAXBLOCKSIZE, tx); |
428870ff BB |
391 | VERIFY(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
392 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx) == 0); | |
a08ee875 | 393 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, |
428870ff BB |
394 | dp->dp_meta_objset, obj)); |
395 | } | |
396 | ||
b128c09f BB |
397 | if (spa_version(spa) >= SPA_VERSION_DSL_SCRUB) |
398 | dsl_pool_create_origin(dp, tx); | |
399 | ||
400 | /* create the root dataset */ | |
428870ff | 401 | obj = dsl_dataset_create_sync_dd(dp->dp_root_dir, NULL, 0, tx); |
b128c09f BB |
402 | |
403 | /* create the root objset */ | |
a08ee875 | 404 | VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG, &ds)); |
0fe3d820 BB |
405 | VERIFY(NULL != (os = dmu_objset_create_impl(dp->dp_spa, ds, |
406 | dsl_dataset_get_blkptr(ds), DMU_OST_ZFS, tx))); | |
b128c09f | 407 | #ifdef _KERNEL |
428870ff | 408 | zfs_create_fs(os, kcred, zplprops, tx); |
b128c09f BB |
409 | #endif |
410 | dsl_dataset_rele(ds, FTAG); | |
34dc7c2f BB |
411 | |
412 | dmu_tx_commit(tx); | |
413 | ||
a08ee875 LG |
414 | rrw_exit(&dp->dp_config_rwlock, FTAG); |
415 | ||
34dc7c2f BB |
416 | return (dp); |
417 | } | |
418 | ||
29809a6c MA |
419 | /* |
420 | * Account for the meta-objset space in its placeholder dsl_dir. | |
421 | */ | |
422 | void | |
423 | dsl_pool_mos_diduse_space(dsl_pool_t *dp, | |
424 | int64_t used, int64_t comp, int64_t uncomp) | |
425 | { | |
426 | ASSERT3U(comp, ==, uncomp); /* it's all metadata */ | |
427 | mutex_enter(&dp->dp_lock); | |
428 | dp->dp_mos_used_delta += used; | |
429 | dp->dp_mos_compressed_delta += comp; | |
430 | dp->dp_mos_uncompressed_delta += uncomp; | |
431 | mutex_exit(&dp->dp_lock); | |
432 | } | |
433 | ||
428870ff BB |
434 | static int |
435 | deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) | |
436 | { | |
437 | dsl_deadlist_t *dl = arg; | |
438 | dsl_deadlist_insert(dl, bp, tx); | |
439 | return (0); | |
440 | } | |
441 | ||
a08ee875 LG |
442 | static void |
443 | dsl_pool_sync_mos(dsl_pool_t *dp, dmu_tx_t *tx) | |
444 | { | |
445 | zio_t *zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
446 | dmu_objset_sync(dp->dp_meta_objset, zio, tx); | |
447 | VERIFY0(zio_wait(zio)); | |
448 | dprintf_bp(&dp->dp_meta_rootbp, "meta objset rootbp is %s", ""); | |
449 | spa_set_rootblkptr(dp->dp_spa, &dp->dp_meta_rootbp); | |
450 | } | |
451 | ||
452 | static void | |
453 | dsl_pool_dirty_delta(dsl_pool_t *dp, int64_t delta) | |
454 | { | |
455 | ASSERT(MUTEX_HELD(&dp->dp_lock)); | |
456 | ||
457 | if (delta < 0) | |
458 | ASSERT3U(-delta, <=, dp->dp_dirty_total); | |
459 | ||
460 | dp->dp_dirty_total += delta; | |
461 | ||
462 | /* | |
463 | * Note: we signal even when increasing dp_dirty_total. | |
464 | * This ensures forward progress -- each thread wakes the next waiter. | |
465 | */ | |
466 | if (dp->dp_dirty_total <= zfs_dirty_data_max) | |
467 | cv_signal(&dp->dp_spaceavail_cv); | |
468 | } | |
469 | ||
34dc7c2f BB |
470 | void |
471 | dsl_pool_sync(dsl_pool_t *dp, uint64_t txg) | |
472 | { | |
473 | zio_t *zio; | |
474 | dmu_tx_t *tx; | |
475 | dsl_dir_t *dd; | |
476 | dsl_dataset_t *ds; | |
428870ff | 477 | objset_t *mos = dp->dp_meta_objset; |
29809a6c MA |
478 | list_t synced_datasets; |
479 | ||
480 | list_create(&synced_datasets, sizeof (dsl_dataset_t), | |
481 | offsetof(dsl_dataset_t, ds_synced_link)); | |
34dc7c2f BB |
482 | |
483 | tx = dmu_tx_create_assigned(dp, txg); | |
484 | ||
a08ee875 LG |
485 | /* |
486 | * Write out all dirty blocks of dirty datasets. | |
487 | */ | |
34dc7c2f | 488 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); |
a08ee875 | 489 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
490 | /* |
491 | * We must not sync any non-MOS datasets twice, because | |
492 | * we may have taken a snapshot of them. However, we | |
493 | * may sync newly-created datasets on pass 2. | |
494 | */ | |
495 | ASSERT(!list_link_active(&ds->ds_synced_link)); | |
29809a6c | 496 | list_insert_tail(&synced_datasets, ds); |
34dc7c2f BB |
497 | dsl_dataset_sync(ds, zio, tx); |
498 | } | |
a08ee875 | 499 | VERIFY0(zio_wait(zio)); |
9babb374 | 500 | |
a08ee875 LG |
501 | /* |
502 | * We have written all of the accounted dirty data, so our | |
503 | * dp_space_towrite should now be zero. However, some seldom-used | |
504 | * code paths do not adhere to this (e.g. dbuf_undirty(), also | |
505 | * rounding error in dbuf_write_physdone). | |
506 | * Shore up the accounting of any dirtied space now. | |
507 | */ | |
508 | dsl_pool_undirty_space(dp, dp->dp_dirty_pertxg[txg & TXG_MASK], txg); | |
34dc7c2f | 509 | |
29809a6c MA |
510 | /* |
511 | * After the data blocks have been written (ensured by the zio_wait() | |
512 | * above), update the user/group space accounting. | |
513 | */ | |
a08ee875 LG |
514 | for (ds = list_head(&synced_datasets); ds != NULL; |
515 | ds = list_next(&synced_datasets, ds)) { | |
428870ff | 516 | dmu_objset_do_userquota_updates(ds->ds_objset, tx); |
a08ee875 | 517 | } |
9babb374 BB |
518 | |
519 | /* | |
520 | * Sync the datasets again to push out the changes due to | |
428870ff | 521 | * userspace updates. This must be done before we process the |
29809a6c MA |
522 | * sync tasks, so that any snapshots will have the correct |
523 | * user accounting information (and we won't get confused | |
524 | * about which blocks are part of the snapshot). | |
9babb374 BB |
525 | */ |
526 | zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); | |
a08ee875 | 527 | while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg)) != NULL) { |
9babb374 BB |
528 | ASSERT(list_link_active(&ds->ds_synced_link)); |
529 | dmu_buf_rele(ds->ds_dbuf, ds); | |
530 | dsl_dataset_sync(ds, zio, tx); | |
531 | } | |
a08ee875 | 532 | VERIFY0(zio_wait(zio)); |
9babb374 | 533 | |
428870ff | 534 | /* |
29809a6c MA |
535 | * Now that the datasets have been completely synced, we can |
536 | * clean up our in-memory structures accumulated while syncing: | |
537 | * | |
538 | * - move dead blocks from the pending deadlist to the on-disk deadlist | |
29809a6c | 539 | * - release hold from dsl_dataset_dirty() |
428870ff | 540 | */ |
a08ee875 | 541 | while ((ds = list_remove_head(&synced_datasets)) != NULL) { |
29809a6c | 542 | ASSERTV(objset_t *os = ds->ds_objset); |
428870ff BB |
543 | bplist_iterate(&ds->ds_pending_deadlist, |
544 | deadlist_enqueue_cb, &ds->ds_deadlist, tx); | |
29809a6c MA |
545 | ASSERT(!dmu_objset_is_dirty(os, txg)); |
546 | dmu_buf_rele(ds->ds_dbuf, ds); | |
428870ff BB |
547 | } |
548 | ||
a08ee875 | 549 | while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)) != NULL) { |
34dc7c2f | 550 | dsl_dir_sync(dd, tx); |
a08ee875 | 551 | } |
b128c09f | 552 | |
29809a6c MA |
553 | /* |
554 | * The MOS's space is accounted for in the pool/$MOS | |
555 | * (dp_mos_dir). We can't modify the mos while we're syncing | |
556 | * it, so we remember the deltas and apply them here. | |
557 | */ | |
558 | if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 || | |
559 | dp->dp_mos_uncompressed_delta != 0) { | |
560 | dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD, | |
561 | dp->dp_mos_used_delta, | |
562 | dp->dp_mos_compressed_delta, | |
563 | dp->dp_mos_uncompressed_delta, tx); | |
564 | dp->dp_mos_used_delta = 0; | |
565 | dp->dp_mos_compressed_delta = 0; | |
566 | dp->dp_mos_uncompressed_delta = 0; | |
567 | } | |
568 | ||
428870ff BB |
569 | if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL || |
570 | list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) { | |
a08ee875 | 571 | dsl_pool_sync_mos(dp, tx); |
34dc7c2f BB |
572 | } |
573 | ||
29809a6c MA |
574 | /* |
575 | * If we modify a dataset in the same txg that we want to destroy it, | |
576 | * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it. | |
577 | * dsl_dir_destroy_check() will fail if there are unexpected holds. | |
578 | * Therefore, we want to sync the MOS (thus syncing the dd_dbuf | |
579 | * and clearing the hold on it) before we process the sync_tasks. | |
580 | * The MOS data dirtied by the sync_tasks will be synced on the next | |
581 | * pass. | |
582 | */ | |
29809a6c | 583 | if (!txg_list_empty(&dp->dp_sync_tasks, txg)) { |
a08ee875 | 584 | dsl_sync_task_t *dst; |
29809a6c MA |
585 | /* |
586 | * No more sync tasks should have been added while we | |
587 | * were syncing. | |
588 | */ | |
a08ee875 LG |
589 | ASSERT3U(spa_sync_pass(dp->dp_spa), ==, 1); |
590 | while ((dst = txg_list_remove(&dp->dp_sync_tasks, txg)) != NULL) | |
591 | dsl_sync_task_sync(dst, tx); | |
29809a6c MA |
592 | } |
593 | ||
34dc7c2f | 594 | dmu_tx_commit(tx); |
b128c09f | 595 | |
a08ee875 | 596 | DTRACE_PROBE2(dsl_pool_sync__done, dsl_pool_t *dp, dp, uint64_t, txg); |
34dc7c2f BB |
597 | } |
598 | ||
599 | void | |
428870ff | 600 | dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg) |
34dc7c2f | 601 | { |
29809a6c | 602 | zilog_t *zilog; |
34dc7c2f | 603 | |
29809a6c | 604 | while ((zilog = txg_list_remove(&dp->dp_dirty_zilogs, txg))) { |
a08ee875 | 605 | dsl_dataset_t *ds = dmu_objset_ds(zilog->zl_os); |
29809a6c MA |
606 | zil_clean(zilog, txg); |
607 | ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg)); | |
608 | dmu_buf_rele(ds->ds_dbuf, zilog); | |
34dc7c2f | 609 | } |
428870ff | 610 | ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg)); |
34dc7c2f BB |
611 | } |
612 | ||
613 | /* | |
614 | * TRUE if the current thread is the tx_sync_thread or if we | |
615 | * are being called from SPA context during pool initialization. | |
616 | */ | |
617 | int | |
618 | dsl_pool_sync_context(dsl_pool_t *dp) | |
619 | { | |
620 | return (curthread == dp->dp_tx.tx_sync_thread || | |
9ae529ec | 621 | spa_is_initializing(dp->dp_spa)); |
34dc7c2f BB |
622 | } |
623 | ||
624 | uint64_t | |
625 | dsl_pool_adjustedsize(dsl_pool_t *dp, boolean_t netfree) | |
626 | { | |
627 | uint64_t space, resv; | |
628 | ||
629 | /* | |
34dc7c2f BB |
630 | * If we're trying to assess whether it's OK to do a free, |
631 | * cut the reservation in half to allow forward progress | |
632 | * (e.g. make it possible to rm(1) files from a full pool). | |
633 | */ | |
634 | space = spa_get_dspace(dp->dp_spa); | |
e10b0808 | 635 | resv = spa_get_slop_space(dp->dp_spa); |
34dc7c2f BB |
636 | if (netfree) |
637 | resv >>= 1; | |
638 | ||
639 | return (space - resv); | |
640 | } | |
641 | ||
a08ee875 LG |
642 | boolean_t |
643 | dsl_pool_need_dirty_delay(dsl_pool_t *dp) | |
34dc7c2f | 644 | { |
a08ee875 LG |
645 | uint64_t delay_min_bytes = |
646 | zfs_dirty_data_max * zfs_delay_min_dirty_percent / 100; | |
647 | boolean_t rv; | |
34dc7c2f | 648 | |
a08ee875 LG |
649 | mutex_enter(&dp->dp_lock); |
650 | if (dp->dp_dirty_total > zfs_dirty_data_sync) | |
651 | txg_kick(dp); | |
652 | rv = (dp->dp_dirty_total > delay_min_bytes); | |
653 | mutex_exit(&dp->dp_lock); | |
654 | return (rv); | |
34dc7c2f BB |
655 | } |
656 | ||
657 | void | |
a08ee875 | 658 | dsl_pool_dirty_space(dsl_pool_t *dp, int64_t space, dmu_tx_t *tx) |
34dc7c2f | 659 | { |
a08ee875 LG |
660 | if (space > 0) { |
661 | mutex_enter(&dp->dp_lock); | |
662 | dp->dp_dirty_pertxg[tx->tx_txg & TXG_MASK] += space; | |
663 | dsl_pool_dirty_delta(dp, space); | |
664 | mutex_exit(&dp->dp_lock); | |
665 | } | |
34dc7c2f BB |
666 | } |
667 | ||
668 | void | |
a08ee875 | 669 | dsl_pool_undirty_space(dsl_pool_t *dp, int64_t space, uint64_t txg) |
34dc7c2f | 670 | { |
a08ee875 LG |
671 | ASSERT3S(space, >=, 0); |
672 | if (space == 0) | |
34dc7c2f BB |
673 | return; |
674 | ||
a08ee875 LG |
675 | mutex_enter(&dp->dp_lock); |
676 | if (dp->dp_dirty_pertxg[txg & TXG_MASK] < space) { | |
677 | /* XXX writing something we didn't dirty? */ | |
678 | space = dp->dp_dirty_pertxg[txg & TXG_MASK]; | |
34dc7c2f | 679 | } |
a08ee875 LG |
680 | ASSERT3U(dp->dp_dirty_pertxg[txg & TXG_MASK], >=, space); |
681 | dp->dp_dirty_pertxg[txg & TXG_MASK] -= space; | |
682 | ASSERT3U(dp->dp_dirty_total, >=, space); | |
683 | dsl_pool_dirty_delta(dp, -space); | |
684 | mutex_exit(&dp->dp_lock); | |
34dc7c2f | 685 | } |
b128c09f BB |
686 | |
687 | /* ARGSUSED */ | |
688 | static int | |
a08ee875 | 689 | upgrade_clones_cb(dsl_pool_t *dp, dsl_dataset_t *hds, void *arg) |
b128c09f BB |
690 | { |
691 | dmu_tx_t *tx = arg; | |
692 | dsl_dataset_t *ds, *prev = NULL; | |
693 | int err; | |
b128c09f | 694 | |
a08ee875 | 695 | err = dsl_dataset_hold_obj(dp, hds->ds_object, FTAG, &ds); |
b128c09f BB |
696 | if (err) |
697 | return (err); | |
698 | ||
e10b0808 AX |
699 | while (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { |
700 | err = dsl_dataset_hold_obj(dp, | |
701 | dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); | |
b128c09f BB |
702 | if (err) { |
703 | dsl_dataset_rele(ds, FTAG); | |
704 | return (err); | |
705 | } | |
706 | ||
e10b0808 | 707 | if (dsl_dataset_phys(prev)->ds_next_snap_obj != ds->ds_object) |
b128c09f BB |
708 | break; |
709 | dsl_dataset_rele(ds, FTAG); | |
710 | ds = prev; | |
711 | prev = NULL; | |
712 | } | |
713 | ||
714 | if (prev == NULL) { | |
715 | prev = dp->dp_origin_snap; | |
716 | ||
717 | /* | |
718 | * The $ORIGIN can't have any data, or the accounting | |
719 | * will be wrong. | |
720 | */ | |
e10b0808 | 721 | ASSERT0(dsl_dataset_phys(prev)->ds_bp.blk_birth); |
b128c09f BB |
722 | |
723 | /* The origin doesn't get attached to itself */ | |
724 | if (ds->ds_object == prev->ds_object) { | |
725 | dsl_dataset_rele(ds, FTAG); | |
726 | return (0); | |
727 | } | |
728 | ||
729 | dmu_buf_will_dirty(ds->ds_dbuf, tx); | |
e10b0808 AX |
730 | dsl_dataset_phys(ds)->ds_prev_snap_obj = prev->ds_object; |
731 | dsl_dataset_phys(ds)->ds_prev_snap_txg = | |
732 | dsl_dataset_phys(prev)->ds_creation_txg; | |
b128c09f BB |
733 | |
734 | dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); | |
e10b0808 | 735 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj = prev->ds_object; |
b128c09f BB |
736 | |
737 | dmu_buf_will_dirty(prev->ds_dbuf, tx); | |
e10b0808 | 738 | dsl_dataset_phys(prev)->ds_num_children++; |
b128c09f | 739 | |
e10b0808 | 740 | if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) { |
b128c09f | 741 | ASSERT(ds->ds_prev == NULL); |
a08ee875 | 742 | VERIFY0(dsl_dataset_hold_obj(dp, |
e10b0808 AX |
743 | dsl_dataset_phys(ds)->ds_prev_snap_obj, |
744 | ds, &ds->ds_prev)); | |
b128c09f BB |
745 | } |
746 | } | |
747 | ||
e10b0808 AX |
748 | ASSERT3U(dsl_dir_phys(ds->ds_dir)->dd_origin_obj, ==, prev->ds_object); |
749 | ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_obj, ==, prev->ds_object); | |
b128c09f | 750 | |
e10b0808 | 751 | if (dsl_dataset_phys(prev)->ds_next_clones_obj == 0) { |
428870ff | 752 | dmu_buf_will_dirty(prev->ds_dbuf, tx); |
e10b0808 | 753 | dsl_dataset_phys(prev)->ds_next_clones_obj = |
b128c09f BB |
754 | zap_create(dp->dp_meta_objset, |
755 | DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); | |
756 | } | |
a08ee875 | 757 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
e10b0808 | 758 | dsl_dataset_phys(prev)->ds_next_clones_obj, ds->ds_object, tx)); |
b128c09f BB |
759 | |
760 | dsl_dataset_rele(ds, FTAG); | |
761 | if (prev != dp->dp_origin_snap) | |
762 | dsl_dataset_rele(prev, FTAG); | |
763 | return (0); | |
764 | } | |
765 | ||
766 | void | |
767 | dsl_pool_upgrade_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
768 | { | |
769 | ASSERT(dmu_tx_is_syncing(tx)); | |
770 | ASSERT(dp->dp_origin_snap != NULL); | |
771 | ||
a08ee875 | 772 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, upgrade_clones_cb, |
e10b0808 | 773 | tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE)); |
428870ff BB |
774 | } |
775 | ||
776 | /* ARGSUSED */ | |
777 | static int | |
a08ee875 | 778 | upgrade_dir_clones_cb(dsl_pool_t *dp, dsl_dataset_t *ds, void *arg) |
428870ff BB |
779 | { |
780 | dmu_tx_t *tx = arg; | |
428870ff BB |
781 | objset_t *mos = dp->dp_meta_objset; |
782 | ||
e10b0808 | 783 | if (dsl_dir_phys(ds->ds_dir)->dd_origin_obj != 0) { |
428870ff BB |
784 | dsl_dataset_t *origin; |
785 | ||
a08ee875 | 786 | VERIFY0(dsl_dataset_hold_obj(dp, |
e10b0808 | 787 | dsl_dir_phys(ds->ds_dir)->dd_origin_obj, FTAG, &origin)); |
428870ff | 788 | |
e10b0808 | 789 | if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { |
428870ff | 790 | dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); |
e10b0808 AX |
791 | dsl_dir_phys(origin->ds_dir)->dd_clones = |
792 | zap_create(mos, DMU_OT_DSL_CLONES, DMU_OT_NONE, | |
793 | 0, tx); | |
428870ff BB |
794 | } |
795 | ||
a08ee875 | 796 | VERIFY0(zap_add_int(dp->dp_meta_objset, |
e10b0808 AX |
797 | dsl_dir_phys(origin->ds_dir)->dd_clones, |
798 | ds->ds_object, tx)); | |
428870ff BB |
799 | |
800 | dsl_dataset_rele(origin, FTAG); | |
801 | } | |
428870ff BB |
802 | return (0); |
803 | } | |
804 | ||
805 | void | |
806 | dsl_pool_upgrade_dir_clones(dsl_pool_t *dp, dmu_tx_t *tx) | |
807 | { | |
428870ff BB |
808 | uint64_t obj; |
809 | ||
d6320ddb BB |
810 | ASSERT(dmu_tx_is_syncing(tx)); |
811 | ||
428870ff | 812 | (void) dsl_dir_create_sync(dp, dp->dp_root_dir, FREE_DIR_NAME, tx); |
a08ee875 | 813 | VERIFY0(dsl_pool_open_special_dir(dp, |
428870ff BB |
814 | FREE_DIR_NAME, &dp->dp_free_dir)); |
815 | ||
816 | /* | |
817 | * We can't use bpobj_alloc(), because spa_version() still | |
818 | * returns the old version, and we need a new-version bpobj with | |
819 | * subobj support. So call dmu_object_alloc() directly. | |
820 | */ | |
821 | obj = dmu_object_alloc(dp->dp_meta_objset, DMU_OT_BPOBJ, | |
e10b0808 | 822 | SPA_OLD_MAXBLOCKSIZE, DMU_OT_BPOBJ_HDR, sizeof (bpobj_phys_t), tx); |
a08ee875 | 823 | VERIFY0(zap_add(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
428870ff | 824 | DMU_POOL_FREE_BPOBJ, sizeof (uint64_t), 1, &obj, tx)); |
a08ee875 | 825 | VERIFY0(bpobj_open(&dp->dp_free_bpobj, dp->dp_meta_objset, obj)); |
428870ff | 826 | |
a08ee875 | 827 | VERIFY0(dmu_objset_find_dp(dp, dp->dp_root_dir_obj, |
e10b0808 | 828 | upgrade_dir_clones_cb, tx, DS_FIND_CHILDREN | DS_FIND_SERIALIZE)); |
b128c09f BB |
829 | } |
830 | ||
831 | void | |
832 | dsl_pool_create_origin(dsl_pool_t *dp, dmu_tx_t *tx) | |
833 | { | |
834 | uint64_t dsobj; | |
835 | dsl_dataset_t *ds; | |
836 | ||
837 | ASSERT(dmu_tx_is_syncing(tx)); | |
838 | ASSERT(dp->dp_origin_snap == NULL); | |
a08ee875 | 839 | ASSERT(rrw_held(&dp->dp_config_rwlock, RW_WRITER)); |
b128c09f BB |
840 | |
841 | /* create the origin dir, ds, & snap-ds */ | |
b128c09f BB |
842 | dsobj = dsl_dataset_create_sync(dp->dp_root_dir, ORIGIN_DIR_NAME, |
843 | NULL, 0, kcred, tx); | |
a08ee875 LG |
844 | VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); |
845 | dsl_dataset_snapshot_sync_impl(ds, ORIGIN_DIR_NAME, tx); | |
e10b0808 | 846 | VERIFY0(dsl_dataset_hold_obj(dp, dsl_dataset_phys(ds)->ds_prev_snap_obj, |
b128c09f BB |
847 | dp, &dp->dp_origin_snap)); |
848 | dsl_dataset_rele(ds, FTAG); | |
b128c09f | 849 | } |
9babb374 BB |
850 | |
851 | taskq_t * | |
3558fd73 | 852 | dsl_pool_iput_taskq(dsl_pool_t *dp) |
9babb374 | 853 | { |
3558fd73 | 854 | return (dp->dp_iput_taskq); |
9babb374 | 855 | } |
428870ff BB |
856 | |
857 | /* | |
858 | * Walk through the pool-wide zap object of temporary snapshot user holds | |
859 | * and release them. | |
860 | */ | |
861 | void | |
862 | dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp) | |
863 | { | |
864 | zap_attribute_t za; | |
865 | zap_cursor_t zc; | |
866 | objset_t *mos = dp->dp_meta_objset; | |
867 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
a08ee875 | 868 | nvlist_t *holds; |
428870ff BB |
869 | |
870 | if (zapobj == 0) | |
871 | return; | |
872 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
873 | ||
a08ee875 LG |
874 | holds = fnvlist_alloc(); |
875 | ||
428870ff BB |
876 | for (zap_cursor_init(&zc, mos, zapobj); |
877 | zap_cursor_retrieve(&zc, &za) == 0; | |
878 | zap_cursor_advance(&zc)) { | |
879 | char *htag; | |
a08ee875 | 880 | nvlist_t *tags; |
428870ff BB |
881 | |
882 | htag = strchr(za.za_name, '-'); | |
883 | *htag = '\0'; | |
884 | ++htag; | |
a08ee875 LG |
885 | if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) { |
886 | tags = fnvlist_alloc(); | |
887 | fnvlist_add_boolean(tags, htag); | |
888 | fnvlist_add_nvlist(holds, za.za_name, tags); | |
889 | fnvlist_free(tags); | |
890 | } else { | |
891 | fnvlist_add_boolean(tags, htag); | |
892 | } | |
428870ff | 893 | } |
a08ee875 LG |
894 | dsl_dataset_user_release_tmp(dp, holds); |
895 | fnvlist_free(holds); | |
428870ff BB |
896 | zap_cursor_fini(&zc); |
897 | } | |
898 | ||
899 | /* | |
900 | * Create the pool-wide zap object for storing temporary snapshot holds. | |
901 | */ | |
902 | void | |
903 | dsl_pool_user_hold_create_obj(dsl_pool_t *dp, dmu_tx_t *tx) | |
904 | { | |
905 | objset_t *mos = dp->dp_meta_objset; | |
906 | ||
907 | ASSERT(dp->dp_tmp_userrefs_obj == 0); | |
908 | ASSERT(dmu_tx_is_syncing(tx)); | |
909 | ||
9ae529ec CS |
910 | dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS, |
911 | DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx); | |
428870ff BB |
912 | } |
913 | ||
914 | static int | |
915 | dsl_pool_user_hold_rele_impl(dsl_pool_t *dp, uint64_t dsobj, | |
a08ee875 | 916 | const char *tag, uint64_t now, dmu_tx_t *tx, boolean_t holding) |
428870ff BB |
917 | { |
918 | objset_t *mos = dp->dp_meta_objset; | |
919 | uint64_t zapobj = dp->dp_tmp_userrefs_obj; | |
920 | char *name; | |
921 | int error; | |
922 | ||
923 | ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); | |
924 | ASSERT(dmu_tx_is_syncing(tx)); | |
925 | ||
926 | /* | |
927 | * If the pool was created prior to SPA_VERSION_USERREFS, the | |
928 | * zap object for temporary holds might not exist yet. | |
929 | */ | |
930 | if (zapobj == 0) { | |
931 | if (holding) { | |
932 | dsl_pool_user_hold_create_obj(dp, tx); | |
933 | zapobj = dp->dp_tmp_userrefs_obj; | |
934 | } else { | |
a08ee875 | 935 | return (SET_ERROR(ENOENT)); |
428870ff BB |
936 | } |
937 | } | |
938 | ||
939 | name = kmem_asprintf("%llx-%s", (u_longlong_t)dsobj, tag); | |
940 | if (holding) | |
a08ee875 | 941 | error = zap_add(mos, zapobj, name, 8, 1, &now, tx); |
428870ff BB |
942 | else |
943 | error = zap_remove(mos, zapobj, name, tx); | |
944 | strfree(name); | |
945 | ||
946 | return (error); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Add a temporary hold for the given dataset object and tag. | |
951 | */ | |
952 | int | |
953 | dsl_pool_user_hold(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
a08ee875 | 954 | uint64_t now, dmu_tx_t *tx) |
428870ff BB |
955 | { |
956 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, now, tx, B_TRUE)); | |
957 | } | |
958 | ||
959 | /* | |
960 | * Release a temporary hold for the given dataset object and tag. | |
961 | */ | |
962 | int | |
963 | dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj, const char *tag, | |
964 | dmu_tx_t *tx) | |
965 | { | |
a08ee875 | 966 | return (dsl_pool_user_hold_rele_impl(dp, dsobj, tag, 0, |
428870ff BB |
967 | tx, B_FALSE)); |
968 | } | |
c409e464 | 969 | |
a08ee875 LG |
970 | /* |
971 | * DSL Pool Configuration Lock | |
972 | * | |
973 | * The dp_config_rwlock protects against changes to DSL state (e.g. dataset | |
974 | * creation / destruction / rename / property setting). It must be held for | |
975 | * read to hold a dataset or dsl_dir. I.e. you must call | |
976 | * dsl_pool_config_enter() or dsl_pool_hold() before calling | |
977 | * dsl_{dataset,dir}_hold{_obj}. In most circumstances, the dp_config_rwlock | |
978 | * must be held continuously until all datasets and dsl_dirs are released. | |
979 | * | |
980 | * The only exception to this rule is that if a "long hold" is placed on | |
981 | * a dataset, then the dp_config_rwlock may be dropped while the dataset | |
982 | * is still held. The long hold will prevent the dataset from being | |
983 | * destroyed -- the destroy will fail with EBUSY. A long hold can be | |
984 | * obtained by calling dsl_dataset_long_hold(), or by "owning" a dataset | |
985 | * (by calling dsl_{dataset,objset}_{try}own{_obj}). | |
986 | * | |
987 | * Legitimate long-holders (including owners) should be long-running, cancelable | |
988 | * tasks that should cause "zfs destroy" to fail. This includes DMU | |
989 | * consumers (i.e. a ZPL filesystem being mounted or ZVOL being open), | |
990 | * "zfs send", and "zfs diff". There are several other long-holders whose | |
991 | * uses are suboptimal (e.g. "zfs promote", and zil_suspend()). | |
992 | * | |
993 | * The usual formula for long-holding would be: | |
994 | * dsl_pool_hold() | |
995 | * dsl_dataset_hold() | |
996 | * ... perform checks ... | |
997 | * dsl_dataset_long_hold() | |
998 | * dsl_pool_rele() | |
999 | * ... perform long-running task ... | |
1000 | * dsl_dataset_long_rele() | |
1001 | * dsl_dataset_rele() | |
1002 | * | |
1003 | * Note that when the long hold is released, the dataset is still held but | |
1004 | * the pool is not held. The dataset may change arbitrarily during this time | |
1005 | * (e.g. it could be destroyed). Therefore you shouldn't do anything to the | |
1006 | * dataset except release it. | |
1007 | * | |
1008 | * User-initiated operations (e.g. ioctls, zfs_ioc_*()) are either read-only | |
1009 | * or modifying operations. | |
1010 | * | |
1011 | * Modifying operations should generally use dsl_sync_task(). The synctask | |
1012 | * infrastructure enforces proper locking strategy with respect to the | |
1013 | * dp_config_rwlock. See the comment above dsl_sync_task() for details. | |
1014 | * | |
1015 | * Read-only operations will manually hold the pool, then the dataset, obtain | |
1016 | * information from the dataset, then release the pool and dataset. | |
1017 | * dmu_objset_{hold,rele}() are convenience routines that also do the pool | |
1018 | * hold/rele. | |
1019 | */ | |
1020 | ||
1021 | int | |
1022 | dsl_pool_hold(const char *name, void *tag, dsl_pool_t **dp) | |
1023 | { | |
1024 | spa_t *spa; | |
1025 | int error; | |
1026 | ||
1027 | error = spa_open(name, &spa, tag); | |
1028 | if (error == 0) { | |
1029 | *dp = spa_get_dsl(spa); | |
1030 | dsl_pool_config_enter(*dp, tag); | |
1031 | } | |
1032 | return (error); | |
1033 | } | |
1034 | ||
1035 | void | |
1036 | dsl_pool_rele(dsl_pool_t *dp, void *tag) | |
1037 | { | |
1038 | dsl_pool_config_exit(dp, tag); | |
1039 | spa_close(dp->dp_spa, tag); | |
1040 | } | |
1041 | ||
1042 | void | |
1043 | dsl_pool_config_enter(dsl_pool_t *dp, void *tag) | |
1044 | { | |
1045 | /* | |
1046 | * We use a "reentrant" reader-writer lock, but not reentrantly. | |
1047 | * | |
1048 | * The rrwlock can (with the track_all flag) track all reading threads, | |
1049 | * which is very useful for debugging which code path failed to release | |
1050 | * the lock, and for verifying that the *current* thread does hold | |
1051 | * the lock. | |
1052 | * | |
1053 | * (Unlike a rwlock, which knows that N threads hold it for | |
1054 | * read, but not *which* threads, so rw_held(RW_READER) returns TRUE | |
1055 | * if any thread holds it for read, even if this thread doesn't). | |
1056 | */ | |
1057 | ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); | |
1058 | rrw_enter(&dp->dp_config_rwlock, RW_READER, tag); | |
1059 | } | |
1060 | ||
e10b0808 AX |
1061 | void |
1062 | dsl_pool_config_enter_prio(dsl_pool_t *dp, void *tag) | |
1063 | { | |
1064 | ASSERT(!rrw_held(&dp->dp_config_rwlock, RW_READER)); | |
1065 | rrw_enter_read_prio(&dp->dp_config_rwlock, tag); | |
1066 | } | |
1067 | ||
a08ee875 LG |
1068 | void |
1069 | dsl_pool_config_exit(dsl_pool_t *dp, void *tag) | |
1070 | { | |
1071 | rrw_exit(&dp->dp_config_rwlock, tag); | |
1072 | } | |
1073 | ||
1074 | boolean_t | |
1075 | dsl_pool_config_held(dsl_pool_t *dp) | |
1076 | { | |
1077 | return (RRW_LOCK_HELD(&dp->dp_config_rwlock)); | |
1078 | } | |
1079 | ||
e10b0808 AX |
1080 | boolean_t |
1081 | dsl_pool_config_held_writer(dsl_pool_t *dp) | |
1082 | { | |
1083 | return (RRW_WRITE_HELD(&dp->dp_config_rwlock)); | |
1084 | } | |
1085 | ||
c409e464 | 1086 | #if defined(_KERNEL) && defined(HAVE_SPL) |
a08ee875 LG |
1087 | EXPORT_SYMBOL(dsl_pool_config_enter); |
1088 | EXPORT_SYMBOL(dsl_pool_config_exit); | |
c409e464 | 1089 | |
a08ee875 LG |
1090 | /* zfs_dirty_data_max_percent only applied at module load in arc_init(). */ |
1091 | module_param(zfs_dirty_data_max_percent, int, 0444); | |
1092 | MODULE_PARM_DESC(zfs_dirty_data_max_percent, "percent of ram can be dirty"); | |
c409e464 | 1093 | |
a08ee875 LG |
1094 | /* zfs_dirty_data_max_max_percent only applied at module load in arc_init(). */ |
1095 | module_param(zfs_dirty_data_max_max_percent, int, 0444); | |
1096 | MODULE_PARM_DESC(zfs_dirty_data_max_max_percent, | |
1097 | "zfs_dirty_data_max upper bound as % of RAM"); | |
c409e464 | 1098 | |
a08ee875 LG |
1099 | module_param(zfs_delay_min_dirty_percent, int, 0644); |
1100 | MODULE_PARM_DESC(zfs_delay_min_dirty_percent, "transaction delay threshold"); | |
e95853a3 | 1101 | |
a08ee875 LG |
1102 | module_param(zfs_dirty_data_max, ulong, 0644); |
1103 | MODULE_PARM_DESC(zfs_dirty_data_max, "determines the dirty space limit"); | |
c409e464 | 1104 | |
a08ee875 LG |
1105 | /* zfs_dirty_data_max_max only applied at module load in arc_init(). */ |
1106 | module_param(zfs_dirty_data_max_max, ulong, 0444); | |
1107 | MODULE_PARM_DESC(zfs_dirty_data_max_max, | |
1108 | "zfs_dirty_data_max upper bound in bytes"); | |
c409e464 | 1109 | |
a08ee875 LG |
1110 | module_param(zfs_dirty_data_sync, ulong, 0644); |
1111 | MODULE_PARM_DESC(zfs_dirty_data_sync, "sync txg when this much dirty data"); | |
c409e464 | 1112 | |
a08ee875 LG |
1113 | module_param(zfs_delay_scale, ulong, 0644); |
1114 | MODULE_PARM_DESC(zfs_delay_scale, "how quickly delay approaches infinity"); | |
c409e464 | 1115 | #endif |